STK22C48 Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – 2K x 8 AutoStore™ nvSRAM QuantumTrap™ CMOS Nonvolatile Static RAM

STK22C48
2K x 8 AutoStore™ nvSRAM
QuantumTrap™ CMOS
Nonvolatile Static RAM
FEATURES
• 25ns, 35ns and 45ns Access Times
• “Hands-off” Automatic STORE with External
68µF Capacitor on Power Down
• STORE to Nonvolatile Elements Initiated by
Hardware or AutoStore™ on Power Down
• Automatic RECALL on Power Up
• 10mA Typical I_CC at 200ns Cycle Time
• Unlimited READ, WRITE and RECALL Cycles
• 1,000,000 STORE Cycles to Nonvolatile Ele-
ments
• 100-Year Data Retention in Nonvolatile Ele-
ments
• Single 5V + 10% Operation
• Commercial and Industrial Temperatures
• 28-Pin DIP and SOIC Packages
DESCRIPTION
The Simtek STK22C48 is a fast static RAM with a
nonvolatile element incorporated in each static
memory cell. The SRAM can be read and written an
unlimited number of times, while independent, non-
volatile data resides in Nonvolatile Elements. Data
transfers from the SRAM to the Nonvolatile Elements
(the STORE operation) can take place automatically
on power down. A 68µF or larger capacitor tied from
V_CAP to ground guarantees the STORE operation,
regardless of power-down slew rate or loss of power
from “hot swapping”. Transfers from the Nonvolatile
Elements to the SRAM (the RECALL operation) take
place automatically on restoration of power. A hard-
ware STORE may be initiated with the HSB pin.
BLOCK DIAGRAM
V_CCX V_CAP
Quantum Trap
32 x 512
POWER
CONTROL
A₅
STORE
STORE/
A₆
A₇
STATIC RAM
ARRAY
RECALL
RECALL
CONTROL
A₈
32 x 512
A₉
DQ₀
DQ₁
DQ₂
DQ₃
DQ₄
DQ₅
DQ₆
DQ₇
COLUMN I/O
COLUMN DEC
A₀ A₁ A₂ A₃ A₄ A₁₀
December 2002
1
HSB
PIN CONFIGURATIONS
V_CAP 1
NC 2
A₇ 3
A₆ 4
A₅ 5
A₄ 6
A₃ 7
A₂ 8
A₁ 9
A₀ 10
DQ₀ 11
DQ₁ 12
DQ₂ 13
V_SS 14
28 V_CCX
27 W
26 HSB
25 A₈
24 A₉
23 NC
22 G
21 A₁₀
20 E
19 DQ₇
18 DQ₆ 28 - 300 PDIP
17 DQ_{5 28 - 600 PDIP}
16 DQ_{4 28 - 300 SOIC}
15 DQ_{3 28 - 350 SOIC}
PIN NAMES
A₀ - A₁₀
DQ₀ -DQ₇
E
Address Inputs
Data In/Out
Chip Enable
W
Write Enable
G
G
Output Enable
HSB
Hardware Store Busy (I/O)
E
V_CCX
Power (+ 5V)
W
V_CAP
Capacitor
V_SS
Ground
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